libstdc++-v3/config/locale/generic/collate_members.cc

   1 // std::collate implementation details, generic version -*- C++ -*-
   2
   3 // Copyright (C) 2001-2013 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 //
  26 // ISO C++ 14882: 22.2.4.1.2  collate virtual functions
  27 //
  28
  29 // Written by Benjamin Kosnik <bkoz@redhat.com>
  30
  31 #include <locale>
  32 #include <cstring>
  33
  34 namespace std _GLIBCXX_VISIBILITY(default)
  35 {
  36 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  37
  38   // These are basically extensions to char_traits, and perhaps should
  39   // be put there instead of here.
  40   template<>
  41     int
  42     collate<char>::_M_compare(const char* __one,
  43                               const char* __two) const throw()
  44     {
  45       int __cmp = strcoll(__one, __two);
  46       return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
  47     }
  48
  49   template<>
  50     size_t
  51     collate<char>::_M_transform(char* __to, const char* __from,
  52                                 size_t __n) const throw()
  53     { return strxfrm(__to, __from, __n); }
  54
  55 #ifdef _GLIBCXX_USE_WCHAR_T
  56   template<>
  57     int
  58     collate<wchar_t>::_M_compare(const wchar_t* __one,
  59                                  const wchar_t* __two) const throw()
  60     {
  61       int __cmp = wcscoll(__one, __two);
  62       return (__cmp >> (8 * sizeof (int) - 2)) | (__cmp != 0);
  63     }
  64
  65   template<>
  66     size_t
  67     collate<wchar_t>::_M_transform(wchar_t* __to, const wchar_t* __from,
  68                                    size_t __n) const throw()
  69     { return wcsxfrm(__to, __from, __n); }
  70 #endif
  71
  72 _GLIBCXX_END_NAMESPACE_VERSION
  73 } // namespace